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ENVS 110 SBCC EXAM WITH COMPLETE SOLUTIONS
100% VERIFIED
What are the three levels of Biodiversity? - ANSWER - species diversity
-ecosystem diversity
The number of different kinds of birds in a tropical forest is a measure of what level of biodiversity? - ANSWER species
We have described about __________ species and there are estimated to be about ___________ species in total. - ANSWER 1.9 mill -- 5.5-11 mill
How do kelp forests differ when sea otters are absent? - ANSWER Sea urchin populations rise and deplete kelp forests
A collection of interacting populations of different species in a given area is known as a(n). - ANSWER community
An ecosystem has to be more than 100 acres to be considered an ecosystem.
You Answered - ANSWER false
When an ecosystem covers a large region we refer to it as a. - ANSWER biome
Ecosystem services vs. ecosystem functions. are. ANSWER services are considered beneficial while functions are value neutral
Of the following biomes which one do many scientists consider provides the most valuable ecosystem services? ANSWER coral reefs
According to the biological species concept what is the important thing determining members of a species? ANSWER That the individuals can reproduce and the offspring are fertile
Which level of biodiversity is essential to the process of Natural Selection? Choose the best answer. - ANSWER genetic diversity
Which of the following is TRUE? - ANSWER Mutations are how new traits or versions of traits are created.
Which of the following is always TRUE of biological evolution? - ANSWER it occurs over generations
sexual selection ANSWER This can lead to characteristics in a population that are not necessarily good for survival but are good for getting a mate
darwinian fitness ANSWER This describes an individual's genetic contribution to the next generation, and often is measured by the number of offspring an individual has
natural selection - This is where the environment constitutes the selection pressure
adaptation - We could use this term when referring to a trait of resistance to insecticide in a mosquito constituting a population that is being sprayed by an insecticide.
Allopatric Speciation - ANSWER mode of speciation that occurs when biological populations of the same species become isolated from each other to an extent that prevents or interferes with genetic interchange.
ANSWER endemic species
keystone species - ANSWER linchpins in the community such that the loss of one of these species may have a very large effect on the community
umbrella species - ANSWER Species that have either large habitat needs or other requirements whose conservation results in many other species being conserved at the ecosystem or landscape level
native species - ANSWER A species that has been observed in the form of a naturally occurring and self-sustaining population in historical times.
invasive species - ANSWER species that is not native to a specific location, and that has a tendency to spread to a degree believed to cause damage to the environment,
plants are considered which of the following? - ANSWER -autotroph
-producer
In a food chain which of the above trophic levels is likely to have the largest biomass? - ANSWER 1st trophic level
Q In a food chain which of the above is/are consumer(s)? Mark all that are correct. - ANSWER second, third, and fourth trophic level
In a food chain, if we were to remove trophic level D, which trophic levels are likely to increase in biomass - ANSWER 1st trophic level will increase
Which of the following is FALSE? ANSWER Species in temperate or polar regions have smaller niches on average than those that inhabit the tropics.
One of the possible contributing factors to an increase in diversity in the tropics is
"piggy backing" of species. What are plants that live on other plants? ANSWER epiphytes
An example of the cropping principle would be a predator preying on the most abundant species in the lower level of the trophic, allowing more species to exist in an ecosystem.
Which of the following is a result of the reintroduction of wolves in Yellowstone? Check all that apply - ANSWER -decrease in elk population
-more food for bears
-increased shrubs
Mass extinctions eliminated all species on the planet and life had to evolve again. - ANSWER false -- they were a huge loss of species but not of all species and were followed by large radiations of new species
Based on several methods of estimation, levels of extinction in the near future are expected to be___________ that of historic levels that are based on fossil records. - ANSWER 100-1000 times
If there is fragmentation of habitat, which of the following would we expect? ANSWER An increased percentage of habitat impacted from the edge effect.
We would see a lower level of biodiversity than a similar sized area within intact habitat
Which of the following is most likely to make a community susceptible to invasion by a non-native species? ANSWER having a vacant niche
What would be the key determinant of an invasive species? - ANSWER Causing ecological and/or economic harm
